一种用于PWM控制Buck型DC-DC变换器的带隙基准源  

A CMOS Bandgap Reference for PWM Control Buck DC-DC Converters

作　　者：王宇星[1] 朱波 

机构地区：[1]无锡科技职业学院,江苏无锡214028 [2]无锡新硅微电子有限公司,江苏无锡214028

出　　处：《电子器件》2013年第2期252-255,共4页Chinese Journal of Electron Devices

摘　　要：在DC-DC转换器芯片设计中,用于产生参考电压的带隙基准精度直接影响芯片的控制精度,设计了一种用于低压型DC-DC转换器芯片内的基准电路。电路基于BJT的Widler型电压基准基本原理,经过理论分析和仿真模拟,采用东部BD0.35μm BCD工艺流片成功。在-40℃～160℃温度范围条件下进行仿真,当VIN=4.75 V,-25℃～160℃的温度系数是22×10-6/℃,低频下PSRR为-57.37 dB。电源电压从7.5 V～18 V的变化范围内,基准输出变化了0.03 mV/V。整个带隙基准电压源具有好的综合性能。The precision of bandgap voltage reference is vital to DC-DC converter design,so a high-precision bandgap reference source for Buck DC-DC converters is presented.Circuit is based on BJT Widler voltage reference principle.After theoretical analysis and simulation,the circuit was fabricated in BD 0.35 μm process.In the-40 ℃-160 ℃ temperature range under the conditions of the simulation,when the VIN=4.75 V,-25 ℃-160 ℃ temperature coefficient is 22×10-6/ ℃,low frequency PSRR-57.37 dB.Operating supply power from 7.5 V to 18 V,the circuit variation rate is of 0.03 mV/V,so the proposed BGR has a good performance.

关 键 词：降压型DC-DC转换器 CMOS带隙基准源 BCD工艺 温度系数 

分 类 号：TM464[电气工程—电器]